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Jamesite: Pb2Zn2Fe+++5(AsO4)5O4 Duftite-beta: PbCu(AsO4)(OH)
Comments: Reddish-brown bladed jamesite crystals overgrown with white dolomite and associated with dark green duftite. Location: Tsumeb mine, Tsumeb, Otavi District, Oshikoto, Namibia. Scale: See Image. © Rruff Database
Jerrygibbsite: (Mn,Zn)9(SiO4)4(OH)2
Comments: Pale pink interlocking anhedral jerrygibbsite grains associated with black zincite and franklinite. Co-type specimen. Location: Parker Shaft, Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA. Scale: See Image. © Rruff Database
Kamaishilite: Ca2Al2SiO6(OH)2
Comments: Colorless crystalline massive kamaishilite. Location: Kamaishi mine, Iwate Prefecture, Tohoku Region, Honshu Island, Japan. Scale: See Image. © Rruff Database
Karchevskyite: [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]
Comments: Colorless hexagonal plates of karchevskyite, co-type material, associated with phlogopite, dolomite, pyrite, and magnetite. Location: Zheleznyi mine, Kovdor Massif, Kola Peninsula, Russia. Scale: See Image. © Rruff Database
Katoite: Ca3Al2(SiO4)3-x(OH)4x x=1.5-3
Comments: Pale yellow to colorless euhedral katoite crystals associated with dark brown andradite crystals. Location: Wilui River, Russia. Scale: See Image. © Rruff Database
Katophorite: Na(CaNa)Fe++4(Al,Fe+++)Si7AlO22(OH)2 Yoshimuraite: (Ba,Sr)2(Mn,Fe)2(Ti,Fe)(Si2O7)2(PO4,SO4)(OH)
Comments: Dark green katophorite associated with yoshimuraite. Inset fragment shows the transparency of the katophorite. Location: Toguchi mine, Shidara, Kitashidara-Gun, Aichi, Japan. Scale: See Image. © Rruff Database
Keiviite-(Yb): (Yb,Y)2Si2O7
Comments: White massive blebs of keiviite-(Yb) in blue-green fluorite. Location: Mount Ploskaja, west Keivy, Kola, Russia. Scale: See Image. © Rruff Database
Kellyite: (Mn++,Mg,Al)3(Si,Al)2O5(OH)4
Comments: Light-yellow irregular to platy tablets of kellyite in matrix. Location: Near Bald Knob, Alleghany County, North Carolina, USA. Scale: See Image. © Rruff Database
Khanneshite: (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5
Comments: Vitreous orange massive khanneshite on single grain. Location: Tuliylukht Bay, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: See Image. © Rruff Database
Kinoshitalite: (Ba,K)(Mg,Mn,Al)3Si2Al2O10(OH)2
Comments: Yellowish brown platy crystals of kinshitalite in granular matrix of grayish tephroite. Location: Hokkejino, Kyoto Prefecture, Kinki Region, Honshu Island, Japan. Scale: See Image. © Rruff Database